JP6837607B1 - Gas insulation switchgear - Google Patents

Abstract

Inside the closed container filled with the insulating gas, a fixed side electrode (11) and a movable side electrode (12) driven by a drive mechanism attached to the closed container and brought into contact with and separated from the fixed side electrode (11) are provided. A gas-insulated switching device (1) provided with a first magnetic material provided inside the outer periphery of the fixed side electrode (11) and a tubular second magnetic material surrounding the fixed side electrode (11). A body and an energizing terminal (15) provided on the outer periphery of the movable side electrode (12) are provided, and at least one of the first magnetic material and the second magnetic material is the movable direction of the movable side electrode (12). It is a magnet magnetized in.

Description

The present application relates to a gas-insulated switchgear.

It is disclosed that when two points of a stopped transmission line are grounded, a closed loop is formed, so that magnetic fluxes due to the currents of the healthy phase of the same line and the currents of other healthy lines are interlinked and an electromagnetic induction current flows (for example). See Non-Patent Document 1). It is the responsibility of the switchgear installed in the power transmission and distribution system to connect and disconnect the circuit, and it is necessary to cut off the electromagnetic induction current that has flowed. For example, in Japan, the Institute of Electrical Engineers of Japan Electrical Standards Research Council standard JEC2310 indicates that when the rating is 72 to 120 kV, the energization current is ~ 1200 A, the recovery voltage is 1 kV, and the switching current is 200 A.

When the rated voltage is several kV or more, the switchgear is installed inside a pressure tank filled with an insulating gas in order to improve the insulating performance such as along the surface. As the insulating gas, SF ₆ gas having excellent insulation performance has been mainly used in the past. However, since SF ₆ gas is a greenhouse gas with a very high global warming potential, its release into the atmosphere is currently regulated, and as an alternative insulating gas with a low global warming potential to replace _{SF 6 gas, for example.} The use of dry air, CO ₂ , N ₂ and other gases is desired. _{When SF 6} gas having high breaking performance is used as the insulating gas, the electromagnetic induction current can be cut off by the so-called normal cutting method. The normal cutting method is a method in which an electric current is cut off by extending an arc generated when the electrodes are opened by a driving device. However, in _{the case of dry air having a blocking performance of about 1/100 of that of SF 6} gas, there is a problem that it is difficult to shut off by the normal cutting method.

To solve the above-mentioned problems, for example, a method of interrupting a current by installing a magnet inside a switchgear and rotating an arc generated when the current is interrupted is disclosed (see, for example, Patent Document 1). ). The rotation of the arc when a magnet is used is generated by the electromagnetic force between the current flowing in the arc and the magnetic field orthogonal to the arc. Further, in order to improve the arc blocking performance, a magnetic material is installed in the vicinity of the magnet for the purpose of strengthening the magnetic field generated by the magnet.

Japanese Unexamined Patent Publication No. 2010-251056

"Disconnector in gas-insulated switchgear, large current cutoff of grounding device", IEEJ Transactions on Electricity and Energy, Vol. 112, NO. 11, p987-996, 1992

In the structure of the opening / closing device in Patent Document 1, a ring-shaped magnetic material having an inner diameter larger and a smaller outer diameter than the permanent magnet is arranged on the upper surface of the ring-shaped permanent magnet so as to be coaxial with the permanent magnet. The magnetic field generated from the permanent magnet is distorted by the body, and the magnetic field in the radial direction on the fixed electrode can be strengthened. However, when the permanent magnet and the magnetic material are provided close to each other, the arc generated when the current is cut off moves to the vicinity of the outer periphery of the movable side electrode due to the strengthened magnetic field, and the movable side electrode such as the energizing terminal is provided. There was a problem of damaging the parts provided on the outer periphery of the magnet.

The present application has been made to solve the above-mentioned problems, and an object of the present application is to obtain a gas-insulated switchgear in which damage to the energizing terminal provided on the outer periphery of the movable side electrode due to an arc is suppressed. It is supposed to be.

The gas-insulated opening / closing device disclosed in the present application is movable inside a closed container filled with an insulating gas and is driven by a fixed-side electrode and a drive mechanism attached to the closed container to be brought into contact with and separated from the fixed-side electrode. A gas-insulated opening / closing device including a side electrode, a circuit breaker composed of the fixed side electrode and the movable side electrode, and a first magnetic material provided inside the outer periphery of the fixed side electrode. When a second magnetic cylindrical surrounding said fixed electrode, and a conduction terminal provided on the outer periphery of the movable side electrode, the a first magnetic body is cylindrical, the first at least one of Ri magnets der magnetized in the direction of the movable of the movable side electrode, the first magnetic member and the second magnetism of the magnetic body and the arranged concentrically second magnetic body The distance to the body is the same from any part of the outer peripheral side surface of the first magnetic body, and the distance from the first magnetic body to the second magnetic body is equal to that when the second magnetic body is absent. strong magnetic field in the direction of the outer periphery of the breaker provided it is that formed.

According to the gas-insulated switchgear disclosed in the present application, it is possible to suppress damage to the energizing terminal provided on the outer periphery of the movable side electrode due to the arc.

It is a structural drawing which showed the outline of the inside of the gas insulation switchgear in Embodiment 1. FIG. FIG. 5 is an enlarged cross-sectional view of a main part of the gas-insulated switchgear according to the first embodiment. FIG. 5 is an enlarged cross-sectional view of a main part of the gas-insulated switchgear according to the first embodiment. FIG. 5 is an enlarged cross-sectional view of a main part of the gas-insulated switchgear according to the first embodiment. It is a figure explaining the rotation of the arc of the gas insulation switchgear in Embodiment 1. FIG. It is a figure explaining the rotation of the arc of the gas insulation switchgear in Embodiment 1. FIG. It is a figure explaining the rotation of the arc of the gas insulation switchgear in Embodiment 1. FIG. It is a figure explaining the influence of the arc of the gas insulation switchgear in Embodiment 1. FIG. It is a figure which shows the distribution of the magnetic field when the permanent magnet of a quadrangular prism is used. FIG. 5 is an enlarged cross-sectional view of a main part of the gas-insulated switchgear according to the first embodiment. FIG. 5 is an enlarged cross-sectional view of a main part of the gas-insulated switchgear according to the second embodiment. FIG. 5 is an enlarged cross-sectional view of a main part of the gas-insulated switchgear according to the third embodiment. FIG. 5 is an enlarged cross-sectional view of a main part of the gas-insulated switchgear according to the fourth embodiment. It is a figure explaining the influence of the arc of the gas insulation switchgear in Embodiment 4.

Hereinafter, the gas-insulated switchgear of the embodiment will be described with reference to the drawings. In each figure, the same or corresponding members and parts will be described with the same reference numerals.

Embodiment 1.
FIG. 1 is a structural diagram showing an outline of the inside of the gas-insulated switchgear 1. The gas-insulated switchgear 1 is provided with pressure tanks 4a and 4b, which are airtight containers, adjacent to each other inside the cubicle 6 which is a metal housing. In the internal space of the pressure tanks 4a and 4b, an _{insulating gas having a low global warming potential such as dry air, CO 2} and N ₂ is sealed at a high pressure of, for example, about 0.5 MPa to 0.7 MPa in absolute pressure. The gas-insulated switchgear 1 has a structure in which the current drawn from the cable 7 is drawn out to the bus 9 connected to the upper part in the pressure tank 4a via the vacuum circuit breaker 2 and the disconnector 3. A vacuum circuit breaker 2 and a disconnector 3 are connected to the inside of the pressure tank 4b via a main circuit conductor 8. To open and close the vacuum circuit breaker 2 and the disconnector 3, a drive device 5 which is attached to the outside of the pressure tank 4b via a tank wall 10 and has a drive mechanism is used. The disconnector 3 is a device for disconnecting the main circuit, and is connected to the vacuum circuit breaker 2 and other devices via a conductor made of, for example, a copper plate. As long as the drive mechanism is attached to the closed container, the mounting position may be outside or inside the closed container.

The configuration of the disconnector 3, which is the main part of the present application, will be described. 2 to 4 are enlarged cross-sectional views of a main part of the disconnector 3 of the gas-insulated switchgear 1 according to the first embodiment. FIG. 2 is a cross-sectional view of the disconnector 3 when the pole is opened, FIG. 3 is a cross-sectional view of the disconnector 3 when the pole is closed, and FIG. 4 is a cross-sectional view of the disconnector 3 when the pole is opened during current cutoff. As shown in FIG. 2, the disconnector 3 is composed of a fixed side electrode 11 and a movable side electrode 12 provided so as to be detachable for opening an electric circuit, and an arc shield 16 surrounding each of these electrodes. The fixed side electrode 11 has, for example, a cylindrical shape, and is provided so as to extend in the movable direction of the movable side electrode 12. In FIGS. 2 to 4, the left-right direction is the movable direction of the movable side electrode 12. The movable side electrode 12 is driven by a movable side electrode rod (not shown) connected to the driving device 5 shown in FIG. The movable side electrode 12 is movable so as to be in contact with and separated from the fixed side electrode 11. The movable side electrode 12 has, for example, a cylindrical shape and is provided so as to extend in the movable direction. The arc shield 16 is a member that relaxes the electric fields of the fixed side electrode 11 and the movable side electrode 12 and protects the fixed side electrode 11 and the movable side electrode 12 from damage caused by the arc. Further, the arc shield 16 suppresses adhesion of melt caused by the arc to the fixed side electrode 11 and the movable side electrode 12. The fixed side electrode 11 is provided with a fixed side arc shield 16a, and the movable side electrode 12 is provided with a movable side arc shield 16b.

A permanent magnet 13, which is a first magnetic material having a cylindrical shape, is provided in the hollow portion 12a at the center of the movable side electrode 12 inside the outer circumference of the movable side electrode 12. The permanent magnet 13 is magnetized in the movable direction of the movable side electrode 12, and for example, the side facing the fixed side electrode 11 is the north pole. The permanent magnet 13 is, for example, a neodymium magnet, a samarium-cobalt magnet, and a ferrite magnet, but is not limited thereto. Here, the permanent magnet 13 is provided at a position where the end face of the movable side electrode 12 and the end face of the permanent magnet 13 coincide with each other, but the installation position of the permanent magnet 13 is not limited to this. Without matching the end face of the movable side electrode 12 and the end face of the permanent magnet 13, the cavity 12a of the movable side electrode 12 is formed deeply, and the permanent magnet 13 is arranged on the inner side of the movable side electrode 12. It doesn't matter. This is to suppress the influence of heat caused by the arc. By suppressing the influence of heat, the thermal demagnetization of the permanent magnet 13 can be suppressed.

The magnetic body 14, which is a second magnetic body having a cylindrical shape, is arranged concentrically with the permanent magnet 13 and is provided on the movable side arc shield 16b so as to surround the movable side electrode 12. The magnetic material 14 is a ferromagnet such as iron having a high magnetic permeability or an alloy containing iron. Since the permanent magnet 13 has a cylindrical shape and the magnetic body 14 provided on the concentric circles of the permanent magnet 13 has a cylindrical shape, the distance between the permanent magnet 13 and the magnetic body 14 is any of the outer peripheral side surfaces of the permanent magnet 13. Equal from the point. Therefore, a uniform magnetic field is formed between the permanent magnet 13 and the magnetic body 14. Here, the magnetic body 14 is provided inside the movable arc shield 16b, but the installation position of the magnetic body 14 is not limited to this, and the magnetic body 14 may be provided on the outer peripheral side of the movable arc shield 16b. I do not care.

The energizing terminal 15 is provided on the outer periphery of the movable side electrode 12. The energizing terminal 15 is a terminal that is connected to an energizing portion (not shown) as an energizing path connected to another device and allows a current to flow between the movable side electrode 12 and the energizing portion. The energizing terminal 15 is composed of, for example, a spring component that can be energized. The component provided on the outer circumference of the movable side electrode 12 is not limited to the energizing terminal 15, and may be another component. Further, the position where the energizing terminal 15 is installed in the movable side electrode 12 is not limited to the side in contact with and separated from the fixed side electrode 11.

The movable side electrode 12 is driven in the left-right direction in FIGS. 2 to 4 by the driving device 5 shown in FIG. By driving the movable side electrode 12 to the right, the movable side electrode 12 and the fixed side electrode 11 are closed as shown in FIG. By driving the movable side electrode 12 to the left from the closed state, the movable side electrode 12 and the fixed side electrode 11 are opened. As shown in FIG. 4, if the movable side electrode 12 and the fixed side electrode 11 are energized at the time of opening the pole, an arc 17 is generated between these electrodes.

The rotation of the arc 17 will be described. 5 to 7 are views for explaining the rotation of the arc 17 in the gas-insulated switchgear 1 according to the first embodiment, and FIG. 5 is a cross-sectional view taken from the direction of arrow A in the alternate long and short dash line of FIG. 6 and 7 are perspective views schematically showing how the arc 17 generated at the time of opening the pole leads to rotation. Note that in FIG. 5, the movable arc shield and the energizing terminal are omitted. The magnetic field is uniformly distributed between the permanent magnet 13 and the magnetic body 14, as shown in the direction 18 of the magnetic field in FIG. When a magnetic field is not applied to the arc 17 when the arc 17 is generated by opening the pole, as shown in FIG. 6, the current mainly consists of components in the direction perpendicular to the electrodes and flows in the direction of the arrow. When the magnetic field from the permanent magnet 13 is applied to the arc 17, the Lorentz force 19 acts on the current in the direction perpendicular to the direction 18 of the magnetic field, so that the arc 17 is placed on the movable electrode 12. It starts to rotate. As shown in FIG. 5, the Lorentz force 19 acts in the direction of rotation with respect to the center of the permanent magnet 13. As the arc 17 is rotated by the Lorentz force 19, the direction of the current is bent as shown in FIG. 7, and the current changes from the direction perpendicular to the electrode to the direction horizontal to the electrode.

The influence of the arc 17 on the energizing terminal 15 will be described. FIG. 8 is a diagram illustrating the influence of the arc 17 of the gas-insulated switchgear 1 in the first embodiment. In the figure, the direction 18a of the magnetic field shown by the broken line is the direction of the magnetic field when the magnetic body 14 is not provided, and the direction 18 of the magnetic field shown by the solid line is the direction of the magnetic field in the present embodiment in which the magnetic body 14 is provided. Is. When the magnetic body 14 is not provided, a strong magnetic field is formed in the vicinity of the permanent magnet 13, that is, in the position close to the energizing terminal 15. In the direction of the magnetic field 18a, the arc 17 rotates at a position close to the energizing terminal 15. When the arc 17 rotates, if the main component is that the current of the arc 17 flows in the direction perpendicular to the paper surface, the Lorentz force 19 acts in the direction of the energizing terminal 15. Therefore, the arc 17 may roll or come into contact with the energizing terminal 15. When the arc 17 comes into contact with the energizing terminal 15, the energizing terminal 15 may melt and burn out. Further, even when the energizing terminal 15 does not melt, the energizing performance of the energizing terminal 15 may deteriorate due to the melt generated by the arc 17 coming into contact with the energizing terminal 15.

When the magnetic body 14 is provided, a strong magnetic field is formed not in the vicinity of the permanent magnet 13 but in the direction of the outer periphery of the breaker 3 provided with the magnetic body 14 from the permanent magnet 13. In the direction 18 of the magnetic field, the arc 17 rotates at a position close to the magnetic body 14 between the permanent magnet 13 and the magnetic body 14, that is, a position away from the energizing terminal 15 in the direction of the outer periphery of the disconnector 3. Therefore, when the arc 17 rotates in the direction 18 of the magnetic field, the Lorentz force 19 does not act in the direction of the energizing terminal 15 when the main component is that the current of the arc 17 flows in the direction perpendicular to the paper surface. Therefore, damage to the energizing terminal 15 caused by the arc 17 is suppressed. Further, since a uniform magnetic field is formed between the permanent magnet 13 and the magnetic body 14, the Lorentz force 19 does not act in the direction of the energizing terminal 15, and the energizing terminal 15 caused by the arc 17 Damage is suppressed. FIG. 9 is a cross-sectional view similar to FIG. 5 showing the distribution of the magnetic field when the permanent magnet 13 is not a cylinder but is, for example, a quadrangular prism. When the permanent magnet 13 is a square column, the distance between the permanent magnet 13 and the magnetic body 14 is not equal, so that a uniform magnetic field is not formed between the permanent magnet 13 and the magnetic body 14. When the distance between the permanent magnet 13 and the magnetic body 14 is short, a magnetic field like the direction 18 of the magnetic field shown in FIG. 8 is formed, and when the distance between the permanent magnet 13 and the magnetic body 14 is long, the magnetic field is shown in FIG. A magnetic field such as the direction 18a of the magnetic field shown in 8 is formed. Although a uniform magnetic field is not formed between the permanent magnet 13 and the magnetic body 14, there is a place where a magnetic field is formed as shown in the direction 18 of the magnetic field shown in FIG. Fifteen damages are suppressed. In order to more effectively suppress damage to the energizing terminal 15, a cylindrical permanent magnet 13 and a cylindrical magnetic body 14 are arranged concentrically, and between the permanent magnet 13 and the magnetic body 14. It is desirable to form a uniform magnetic field. However, the shape of the permanent magnet 13 is not limited to the cylindrical shape, and may be a quadrangular prism or a polygonal prism. Further, the shape of the magnetic body 14 is not limited to a cylindrical shape, and may be a cylindrical shape having an outer circumference formed by a polygon. Further, the arrangement of the permanent magnet 13 and the magnetic body 14 is not limited to the concentric circles.

In the above, the cylindrical magnetic body 14 having no cut portion is provided, but the shape of the magnetic body 14 is not limited to this. FIG. 10 is a cross-sectional view taken from the direction of arrow A in the alternate long and short dash line of FIG. The magnetic material 14 which is the second magnetic material is cut at at least one place in the movable direction of the movable side electrode 12 to provide a gap, and here the magnetic material 14 is divided into two. .. The magnetic body 14 is divided into a magnetic body 14a and a magnetic body 14b through a gap of, for example, about several mm. By providing the gap, it is possible to suppress the magnetic saturation of the magnetic material 14 when a large current is applied. By suppressing magnetic saturation, a magnetic field is maintained between the permanent magnet 13 and the magnetic body 14.

As described above, in this gas-insulated switchgear 1, since the movable side electrode 12 provided with the permanent magnet 13 is surrounded and the tubular magnetic body 14 is provided, it is a component provided on the outer periphery of the movable side electrode 12. The Lorentz force 19 does not act in the direction of the energizing terminal 15, and damage to the energizing terminal 15 caused by the arc 17 can be suppressed. Further, when the permanent magnet 13 has a cylindrical shape and the magnetic body 14 provided concentrically with the permanent magnet 13 has a cylindrical shape, a uniform magnetic field is formed between the permanent magnet 13 and the magnetic body 14. The Lorentz force 19 does not act in the direction of the energizing terminal 15, and damage to the energizing terminal 15 caused by the arc 17 can be suppressed more effectively. Further, since the Lorentz force 19 does not act in the direction of the outer periphery of the movable side electrode 12, the energizing terminal 15 can be provided on the outer periphery of the movable side electrode 12 on the side that comes into contact with the fixed side electrode 11. Further, when the movable side electrode 12 is cut in the movable direction at at least one position of the magnetic body 14 and a gap is provided, the magnetic saturation of the magnetic body 14 can be suppressed.

Embodiment 2.
The gas-insulated switchgear 1 according to the second embodiment will be described. FIG. 11 is an enlarged cross-sectional view of a main part of the disconnector 3 of the gas-insulated switchgear 1. The disconnector 3 of the gas-insulated switchgear 1 according to the second embodiment has a permanent magnet 20 whose magnetizing direction is opposite to that of the permanent magnet 13 on the movable side instead of the magnetic body 14 provided in the first embodiment. It is configured to be provided on the arc shield 16b.

A permanent magnet 13, which is a first magnetic material having a cylindrical shape, is provided in the hollow portion 12a at the center of the movable side electrode 12 inside the outer circumference of the movable side electrode 12. The permanent magnet 13 is magnetized in the movable direction of the movable side electrode 12, and for example, the side facing the fixed side electrode 11 is the north pole. A permanent magnet 20 which is a second magnetic body having a cylindrical shape is arranged concentrically with the permanent magnet 13 and is provided on the movable arc shield 16b so as to surround the movable electrode 12. The permanent magnet 20 is magnetized in the movable direction of the movable side electrode 12 so that the magnetizing direction is opposite to that of the permanent magnet 13. For example, the side facing the fixed side electrode 11 is the S pole. The permanent magnet 20 is, for example, a neodymium magnet, a samarium-cobalt magnet, and a ferrite magnet, but is not limited thereto.

By replacing the magnetic body 14 with the permanent magnet 20 as the second magnetic material, the value of the magnetic flux density of the magnetic field formed between the permanent magnet 13 and the permanent magnet 20 is compared with the case of the first embodiment. Will be expensive. Therefore, the force acting on the arc generated at the time of interruption becomes stronger and the arc is easily interrupted, the possibility of contact between the arc and the energizing terminal 15 is further reduced, and damage to the energizing terminal 15 caused by the arc is further suppressed. Can be done. By increasing the value of the magnetic flux density of the magnetic field formed between the permanent magnet 13 and the permanent magnet 20, the magnetic flux in the direction 18a of the magnetic field shown in FIG. 8 is relatively reduced, which is caused by the arc. Damage to the energizing terminal 15 can be further suppressed.

As described above, in the gas-insulated switching device 1, the permanent magnet 20 is provided on the movable arc shield 16b in the direction opposite to that of the permanent magnet 13, so that the permanent magnet 13 and the permanent magnet 20 are combined. Since the value of the magnetic flux density of the magnetic field formed between them becomes high, the force acting on the arc generated at the time of interruption becomes strong, and the damage to the energizing terminal 15 caused by the arc can be further suppressed.

Embodiment 3.
The gas-insulated switchgear 1 according to the third embodiment will be described. FIG. 12 is an enlarged cross-sectional view of a main part of the disconnector 3 of the gas-insulated switchgear 1. The disconnector 3 of the gas-insulated switchgear 1 according to the second embodiment has a configuration in which a magnetic body 21 is provided on the movable side electrode 12 instead of the permanent magnet 13 provided in the second embodiment.

Inside the outer circumference of the movable side electrode 12, a magnetic material 21 which is a first cylindrical magnetic material is provided in the hollow portion 12a at the center of the movable side electrode 12. The magnetic material 21 is a ferromagnet such as iron having a high magnetic permeability or an alloy containing iron. A permanent magnet 20 which is a second magnetic body having a cylindrical shape is arranged concentrically with the magnetic body 21 and is provided on the movable side arc shield 16b so as to surround the movable side electrode 12. The permanent magnet 20 is magnetized in the movable direction of the movable side electrode 12, for example, the side facing the fixed side electrode 11 is the S pole. The permanent magnet 20 is, for example, a neodymium magnet, a samarium-cobalt magnet, and a ferrite magnet, but is not limited thereto.

By using the permanent magnet 20 as the second magnetic material, the value of the magnetic flux density of the magnetic field formed between the magnetic material 21 and the permanent magnet 20 becomes larger than that in the case of the first embodiment, so that the magnetic material is blocked. The force acting on the arc that is sometimes generated becomes stronger, the arc is easily cut off, the possibility of contact between the arc and the energizing terminal 15 is further reduced, and damage to the energizing terminal 15 caused by the arc can be further suppressed. The value of the magnetic flux density is larger than that of the first embodiment because the permanent magnet 20 has a larger volume than the permanent magnet 13. Further, since the permanent magnet is not provided on the movable side electrode 12 to be energized and the permanent magnet 20 is provided on the movable side arc shield 16b away from the movable side electrode 12, the permanent magnet 20 is demagnetized by the heat generated by the energization. Will not be affected by. Therefore, the reliability of the gas-insulated switchgear 1 is improved.

As described above, in the gas-insulated switching device 1, the first magnetic body is the magnetic body 21 and the second magnetic body is the permanent magnet 20, so that the magnetic body 21 and the permanent magnet 20 are formed. Since the value of the magnetic flux density of the magnetic field is larger than that of the first embodiment, the force acting on the arc generated at the time of interruption becomes stronger, and the damage to the energizing terminal 15 caused by the arc can be further suppressed. Further, by providing the permanent magnet 20 on the movable side arc shield 16b away from the movable side electrode 12, demagnetization of the permanent magnet 20 due to heat generated by energization can be suppressed.

Embodiment 4.
The gas-insulated switchgear 1 according to the fourth embodiment will be described. FIG. 13 is an enlarged cross-sectional view of a main part of the disconnector 3 of the gas-insulated switchgear 1. In the disconnector 3 of the gas-insulated switchgear 1 according to the fourth embodiment, the permanent magnet 13 which is the first magnetic body is provided on the fixed side electrode 11, and the magnetic body 14 which is the second magnetic body is the fixed side arc shield. It has a configuration provided in 16a.

A permanent magnet 13, which is a first magnetic material having a cylindrical shape, is provided in the hollow portion 11a at the center of the fixed side electrode 11 inside the outer circumference of the fixed side electrode 11. The permanent magnet 13 is magnetized in the movable direction of the movable side electrode 12, and for example, the side facing the movable side electrode 12 is the north pole. The permanent magnet 13 is, for example, a neodymium magnet, a samarium-cobalt magnet, and a ferrite magnet, but is not limited thereto. The magnetic body 14, which is a second magnetic body having a cylindrical shape, is arranged concentrically with the permanent magnet 13 and is provided on the fixed side arc shield 16a so as to surround the fixed side electrode 11. The magnetic material 14 is a ferromagnet such as iron having a high magnetic permeability or an alloy containing iron. Since the permanent magnet 13 has a cylindrical shape and the magnetic body 14 provided concentrically with the permanent magnet 13 has a cylindrical shape, the distance between the permanent magnet 13 and the magnetic body 14 is any of the outer peripheral side surfaces of the permanent magnet 13. Equal from the point. Therefore, a uniform magnetic field is formed between the permanent magnet 13 and the magnetic body 14.

The influence of the arc 17 on the energizing terminal 15 will be described. FIG. 14 is a diagram illustrating the influence of the arc 17 of the gas-insulated switchgear 1 in the fourth embodiment. In the figure, the direction 18a of the magnetic field shown by the broken line is the direction of the magnetic field when the magnetic body 14 is not provided, and the direction 18 of the magnetic field shown by the solid line is the direction of the magnetic field in the present embodiment in which the magnetic body 14 is provided. Is. When the magnetic body 14 is not provided, a strong magnetic field is formed in the vicinity of the permanent magnet 13. In the direction of the magnetic field 18a, the arc 17 rotates at a position close to the permanent magnet 13. When the arc 17 rotates, if the main component is that the current of the arc 17 flows in the direction perpendicular to the paper surface, the Lorentz force 19 acts in the direction of the energizing terminal 15. Therefore, the arc 17 may roll or come into contact with the energizing terminal 15. When the arc 17 comes into contact with the energizing terminal 15, the energizing terminal 15 may melt and burn out. Further, even when the energizing terminal 15 does not melt, the energizing performance of the energizing terminal 15 may deteriorate due to the melt generated by the arc 17 coming into contact with the energizing terminal 15.

When the magnetic body 14 is provided, a strong magnetic field is formed not in the vicinity of the permanent magnet 13 but in the direction of the outer periphery of the breaker 3 provided with the magnetic body 14 from the permanent magnet 13. In the direction 18 of the magnetic field, the arc 17 rotates at a position close to the magnetic body 14 between the permanent magnet 13 and the magnetic body 14, that is, a position away from the energizing terminal 15 in the direction of the outer periphery of the disconnector 3. Therefore, when the arc 17 rotates in the direction 18 of the magnetic field, the Lorentz force 19 does not act in the direction of the energizing terminal 15 when the main component is that the current of the arc 17 flows in the direction perpendicular to the paper surface. Therefore, damage to the energizing terminal 15 caused by the arc 17 is suppressed. Further, since a uniform magnetic field is formed between the permanent magnet 13 and the magnetic body 14, the Lorentz force 19 does not act in the direction of the energizing terminal 15, and the energizing terminal 15 caused by the arc 17 Damage is suppressed. Further, since a strong magnetic field is formed on the side of the fixed side electrode 11, the rotation of the arc 17 tends to occur at a position close to the fixed side electrode 11. Therefore, the damage caused by the arc 17 of the energizing terminal 15 provided on the movable side electrode 12 is further suppressed.

In the above, the permanent magnet 13 which is the first magnetic material is provided on the fixed side electrode 11, and the magnetic material 14 which is the second magnetic material is provided on the fixed side arc shield 16a. However, the first magnetic material and the second magnetic material are provided. The composition of the magnetic material is not limited to this. The first magnetic material may be a permanent magnet 13, and the second magnetic material may be a permanent magnet whose magnetizing direction is opposite to that of the permanent magnet 13. Further, the first magnetic material may be a ferromagnet, and the second magnetic material may be a permanent magnet magnetized in the movable direction of the movable side electrode 12.

As described above, in this gas-insulated switchgear 1, since the tubular magnetic body 14 is provided around the fixed side electrode 11 provided with the permanent magnet 13, it is a component provided on the outer periphery of the movable side electrode 12. The Lorentz force 19 does not act in the direction of the energizing terminal 15, and damage to the energizing terminal 15 caused by the arc 17 can be suppressed. Further, when the permanent magnet 13 has a cylindrical shape and the magnetic body 14 provided concentrically with the permanent magnet 13 has a cylindrical shape, a uniform magnetic field is formed between the permanent magnet 13 and the magnetic body 14. The Lorentz force 19 does not act in the direction of the energizing terminal 15, and damage to the energizing terminal 15 caused by the arc 17 can be suppressed more effectively. Further, since the permanent magnet 13 and the magnetic body 14 are provided on the side of the fixed side electrode 11, a strong magnetic field is formed on the side of the fixed side electrode 11, and the rotation of the arc 17 is likely to occur at a position close to the fixed side electrode 11. , Damage caused by the arc 17 of the energizing terminal 15 provided on the movable side electrode 12 can be further suppressed.

The present application also describes various exemplary embodiments and examples, although the various features, embodiments, and functions described in one or more embodiments are those of a particular embodiment. It is not limited to application, but can be applied to embodiments alone or in various combinations.
Therefore, innumerable variations not illustrated are envisioned within the scope of the techniques disclosed herein. For example, it is assumed that at least one component is modified, added or omitted, and further, at least one component is extracted and combined with the components of other embodiments.

1 Gas insulation switchgear, 2 Vacuum breaker, 3 Breaker, 4a pressure tank, 4b pressure tank, 5 Drive device, 6 cubicles, 7 cables, 8 main circuit conductors, 9 bus wires, 10 tank walls, 11 fixed side electrodes, 11a Cavity, 12 Movable Electrode, 12a Cavity, 13 Permanent Magnet, 14 Magnetic Material, 15 Energizing Terminal, 16 Arc Shield, 16a Fixed Arc Shield, 16b Movable Arc Shield, 17 Arc, 18 Magnetic Field Direction, 18a Magnetic field direction, 19 Lorentz force, 20 permanent magnet, 21 magnetic material

Claims (4)

Inside a closed container filled with insulating gas,
Fixed side electrode and
A movable side electrode driven by a drive mechanism attached to the closed container and brought into contact with and separated from the fixed side electrode,
A gas-insulated switchgear including a disconnector composed of the fixed-side electrode and the movable-side electrode.
A first magnetic material provided inside the outer circumference of the fixed side electrode and
A tubular second magnetic material surrounding the fixed electrode and
A power supply terminal provided on the outer circumference of the movable side electrode is provided.
At least one of the first magnetic body having a cylindrical shape and the second magnetic body arranged concentrically with the first magnetic body is a magnet magnetized in the movable direction of the movable side electrode. Oh it is,
The distance between the first magnetic material and the second magnetic material is equal from any position on the outer peripheral side surface of the first magnetic material, and the distance is equal to that of the case where the second magnetic material is absent. gas insulated switchgear characterized that you have a strong magnetic field is formed in the direction of the outer periphery of the breaker provided with the second magnetic member from the first magnetic body. Inside a closed container filled with insulating gas,
Fixed side electrode and
A movable side electrode driven by a drive mechanism attached to the closed container and brought into contact with and separated from the fixed side electrode,
A gas-insulated switchgear including a disconnector composed of the fixed-side electrode and the movable-side electrode.
A first magnetic material provided inside the outer circumference of the movable electrode, and
A tubular second magnetic material surrounding the movable electrode and
A power supply terminal provided on the outer circumference of the movable side electrode is provided.
At least one of the first magnetic body having a cylindrical shape and the second magnetic body arranged concentrically with the first magnetic body is a magnet magnetized in the movable direction of the movable side electrode. Oh it is,
The distance between the first magnetic material and the second magnetic material is equal from any position on the outer peripheral side surface of the first magnetic material, and the distance is equal to that of the case where the second magnetic material is absent. gas insulated switchgear characterized that you have a strong magnetic field is formed in the direction of the outer periphery of the breaker provided with the second magnetic member from the first magnetic body. The gas-insulated switchgear according to claim 1 or 2, wherein the second magnetic material is cut at at least one place to provide a gap. The gas-insulated switchgear according to claim 1 or 2, wherein the first magnetic material and the second magnetic material are magnets whose magnetizing directions are opposite to each other.

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